Ulaanbaatar grew outwards because the law handed out plots, not flats.

01 Half the country fits into a single city

Mongolia has 3,591,120 inhabitants spread across an enormous territory: 2.24 people per square kilometre, the lowest density of any sovereign country. And yet roughly half of that population lives in a single place. Ulaanbaatar holds around 1.79 million people, covers a municipality of 4,704 square kilometres and sits at about 1,350 metres of altitude, in a valley between bare mountains.

The contrast is the key to the place: the emptiest country in the world has a capital that concentrates half its inhabitants. That movement — from the countryside to the city, and within a few decades — shapes everything you will see. Administratively the city divides into nine districts, the düüreg, and those into 204 khoroos, which are the units people actually navigate by.

02 Since 2003, every citizen has a right to a plot

The piece that explains it is a land law passed in 2002 and in force from 2003. It granted every Mongolian citizen the right to acquire ownership of a parcel of urban land, and the figure usually cited is around 700 square metres per registered person. Not a flat, not a built dwelling: ground.

Consider what that means for a family arriving from the countryside. You do not have to buy an apartment or join a waiting list: you claim a plot on the edge of town, fence it and move in while you build. Multiplied by hundreds of thousands of arrivals, the result is not a neighbourhood: it is a crown of plots climbing the hillsides, visible from any high point in the city.

03 What a khashaa actually is

The fenced plot is called a khashaa, and that fence of wooden planks is the element that most defines the city's landscape. Inside there may be a ger — the round dwelling of felt and wooden lattice that can be put up and taken down — or a wooden or brick house, or both at once, plus a store shed, a yard and a pit latrine.

A common misunderstanding is worth clearing up here. These areas are called "ger districts", but only around 43% of the people living in them actually occupy a ger; the rest live in fixed wooden or brick structures built inside the same plot. What defines the district is not the felt tent: it is the fenced plot, and what that plot is not connected to.

04 Why the pipes never arrive

A city can hand out land by law from one day to the next. What it cannot do is lay sewerage, running water and district heating at the same speed — least of all uphill and across plots drawn without a prior plan. The result is that around 60% of the capital's population lives in areas without sanitation, without piped water and without a connection to the heat network.

Almost everything else follows from that. Water is bought at kiosks and carried in drums. Sanitation is a pit latrine at the back of the plot. And heating, in a place where the January mean hovers around minus twenty-one degrees, is solved with your own stove: close to 85% of those households burn coal or wood. Each plot is, in practice, a self-contained piece of infrastructure.

05 How to read it on the ground

On the ground the reading is immediate and you do not have to look for it: climb to any high point and turn towards the hillsides. You will see where the asphalt ends and the dirt tracks begin, where the blocks end and the plank fences begin, and how the ordered grid of the centre dissolves into a mosaic of rectangles rising as far as the slope allows.

And you will see that the two cities touch. In the same frame you get a crane raising a new tower and, fifty metres beyond, a plot with its fence and its chimney. That seam is Ulaanbaatar: not a capital that expanded, but a capital that was handed out, and that is still working out how to connect what it already handed out.